After investing lots of effects effort in Guardian Of Piri, this episode uses just Alpha sets and minimal effects (the blue light passing over Alpha, the revolving radar scanner, Moonbase buildings exploding). Note the nice shot of lights going out over the base. There are no Eagle shots.

Roger Roger was born 1911, and died 1995. The French composer produced a large range of library music used in film and television. He was a pioneer of electronic music, using the Moog synthesizers that first appeared in the late 1960s. He used many different aliases, including Cecil Leuter. "Videotronics no.3" is also used in End Of Eternity. Another track by Roger appears in The Infernal Machine.

Georges Teperino was born 1912, and died 1994. The French musician was another pioneer in electronic music. He usually recorded under the name Nino Nardini.

Footage:

Some prints of this episode (such as the US laserdiscs) show an on-screen microphone top left during the opening shot of Koenig and Bergman. On the DVDs (all versions), the frame is zoomed in so the microphone is not seen. Thanks to James Poll.